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Fault arc detection method and protection circuit thereof

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Publication number
CN100432683C
CN100432683C CN 200510033926 CN200510033926A CN100432683C CN 100432683 C CN100432683 C CN 100432683C CN 200510033926 CN200510033926 CN 200510033926 CN 200510033926 A CN200510033926 A CN 200510033926A CN 100432683 C CN100432683 C CN 100432683C
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fault
arc
circuit
detection
method
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CN 200510033926
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Chinese (zh)
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CN1841074A (en )
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吴伟宾
沈乾军
伟 王
新 王
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珠海格力电器股份有限公司
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Abstract

本发明公开了一种故障电弧检测方法及其保护电路,该方法能通过保护电路检测到危险电弧,属于电子领域。 The present invention discloses an arc fault detection method and a protection circuit, which protection circuit can detect dangerous arcing, belongs to the field of electronics. 该方法为:通过信号采样装置实时对电流信号进行采样,并将采样数据提供给信号处理模块,信号处理模块处理完电流信号后,将结果传递给电弧检测控制装置进行检测,电弧检测控制装置在检测到电弧时产生电弧标志,发出切断电路的控制信号,达到对负载的保护。 The method is: a current signal by the real-time sampling means sampling the signal, and supplies the sampling data to the signal processing module, the signal processing module after the current signal has been processed, the results are passed to the arc detection control means detects an arc detection control means when the arc is the arc generation detection flag, issuing a control signal blocking circuit, to protect the load. 本发明的优点在于:在使用电器线路产生断续电弧时,该方法能及时检测到电弧并依靠保护电路切断电源,有效地防止电弧火灾的发生。 Advantage of the present invention is that: when generating the intermittent use of an arc electrical circuit, the method can rely on timely detection of an arc protection circuit and cut off power to effectively prevent occurrence of an arc fire.

Description

故障电弧检测方法及其保护电路技术领域本发明涉及一种故障电弧检测方法及其保护电路,特别涉及一种能检测到危险电弧并自动切断电源的故障电弧保护电路。 Arc fault detection and protection Technical Field The present invention relates to a method for detecting an arc fault protection circuit and, more particularly to a protection circuit for a fault arc can detect dangerous arcing and to automatically cut off the power supply. 背景技术近年来,随着家用电器的普及,电气火灾呈上升趋势,其中故陣电弧(电弧、电火花)是引起电气火灾的主要原因。 BACKGROUND ART In recent years, with the spread of household appliances, electrical fires upward trend, wherein the array so that the arc (arc, spark) is the main cause of electrical fires. 故障电弧可以分短路电弧和接触不良电弧。 Arc fault can be divided arc and short circuit arc bad. 短路电弧是由电路相线之间、相线零线之间、相线地线之间短路引起的大电流产生的电弧。 By short circuiting arc circuit between the phase line, the phase line between the zero line, the short circuit caused by a large current arc generated between a ground phase. 其中短路电弧又可分为持续短路电弧、断续短路电弧。 Which can be divided into continuous short circuit arc short circuit arc, intermittent short circuit arc. 持续短路电弧弓I起火灾的特点是短路电弧能在瞬间产生高温,引起周围易燃物瞬间燃烧;断续短路电弧引起火灾的特点是断续短路电弧持续的时间短,但是能在一段时间内持续产生电弧,引起周围温度持续升高,从而引起周围易燃物燃烧。 I continued short circuiting arc bow fires are characterized by short circuiting arc produces a high temperature in an instant, causing momentary surrounding combustible combustion; short circuiting arc interrupter characteristic fire caused by a short duration of intermittent short-circuiting of the arc, but can be within a period of time continuous arc, causing the ambient temperature continues to rise, thereby causing combustion of inflammable surroundings. 接触不良电弧是由于负载设备的接线端子松动等引起的接触不良产生的电弧。 Poor contact arcing contact arcing is undesirable since the load terminal device generated due to looseness. 接触不良电弧弓I起火灾的特点是接触不良电弧能在一段时间内,持续产生电弧,弓l起周围温度持续升高,从而引起周围易目前,电气线路的过流、漏电、过压保护只能对持续短路电弧起到保护作用,而对其他的电弧不一定能起到保护作用。 I bow arc bad fires are characterized by poor contact arc energy over time, arcing duration, bow l ambient temperature continues to rise, causing current around easily, the electrical circuit overcurrent, leakage, overvoltage protection only We can continue to protect short circuit arc, arc while the other may not be able to play a protective role. 当前已有的故障电弧保护装置,主要针对电力线路中出现的故障电弧,其特征是瞬间产生的大电流持续放电产生的电弧。 Current conventional arc fault protection apparatus, mainly for arc fault occurring in the power line, wherein a large current arc generated instantly generated sustain discharge. 对于电器线路中出现的故障电弧,如接触不良、小电流短路产生的断续的故障电弧,还没有可靠的保护。 For electrical circuit arc fault occurring, such as poor contact, intermittent arcing fault short-circuit current is small, yet reliable protection. 因此对于断续故障电弧引起的电气火灾的保护还存在很大的缺陷。 Therefore, for the protection of electrical fires caused by intermittent arc fault still a lot of deficiencies. 发明内容本发明提供了一种当被保护线路中出现断续电弧时能检测到危险电弧并自动切断电路的故障电弧检测方法及其保护电路。 SUMMARY OF THE INVENTION The present invention provides an arc occurs when the interrupter is in the protected line can detect dangerous arcing and automatically cut off the arc fault detection circuits and a protection circuit. 当在被保护的线路中出现断续故障电弧时,该方法能及时检测到电弧并在其弓I 起电气火灾前切断电源,从而避免火灾或重大事件的发生,达到对电器的保护。 When the intermittent arcing fault occurs in the protected line, which can be detected in time and cut off the power to the arc before its bow I electrical fire, thus avoiding the occurrence of a fire or events, to electrical protection. 实现本发明的技术方案-故障电弧检测方法,该方法能通过故障电弧保护电路检测到危险电弧,其特征在于包括步骤:通过信号采样装置实时对电流信号进行采样,并将采样数据提供给信号处理模块;信号处理模块处理完电流信号,将结果传递给电弧检测控制装置进行检测,当电弧检测控制装置检测到电弧时,产生电弧标志。 Aspect of the present invention is implemented - arc fault detection method by arc fault protection circuit detects dangerous arcing, comprising the steps of: sampling a current signal in real time by the signal sampling means, the sampled data to the signal processing module; current signal processing module processed signals, pass the results to the arc detection control means detects, when the arc detection control means detects an arc, an arc is generated flag. 其中:所述的信号采样装置采样的信号为电流波形; 所述的信号处理模块对电流波形进行处理;所述的电弧检测控制装置对处理后的电流波形进行判断、检测。 Wherein: signal sampling means for sampling the signal according to the current waveform; the current waveform signal processing module for processing; detection control means of the arc current waveform determination processing, detection. 故障电弧保护电路,包括电源部分,其特征在于:所述的故障电弧保护器还包括信号采样装置、信号处理模块、电弧检测控制装置和切断电源模块;所述的信号采样装置为带铁芯的电流互感器;所述的信号处理模块依次连接了全波二极管整流桥、分压电阻Ri和R3;所述的电弧检测控制装置为单片机;所述的切断电源模块依次连接了三极管和执行机构部分。 Arc fault protection circuit comprising a power supply portion, wherein: said arc fault protector further comprises signal sampling means, the signal processing module, and arc detection control means cut off the power module; said signal sampling means is a tape core current transformer; said signal processing module in turn is connected to a full wave diode bridge rectifier, voltage dividing resistors R3 and Ri; arc detection control means for said microcontroller; said disconnecting modules successively connected transistor and the actuator portion . 所述的执行机构部分为常闭触点继电器。 Said actuator portion is a normally closed relay contact. 所述的执行机构部分为常开触点继电器。 Said actuator portion is a normally open relay contact. 所述的执行机构部分为上电脱扣器。 Portion of the actuator is a power release. 所述的执行机构部分为断电脱扣器。 Portion of the actuator is de-energized releases. 所述的执行机构部分为可控硅。 Said actuator portion is a thyristor. 本发明的优点是:在电器上使用的时候,线路产生断续电弧时, 能及时检测到电弧并切断电源,有效地防止电弧火灾的发生。 Advantage of the present invention is that: when used in the electrical, intermittent arc when the line is generated, an arc is detected in time and cut off the power to effectively prevent occurrence of an arc fire. 附图说明图1是本发明执行机构部分为常闭触点继电器和上电脱扣器的图2是本发明执行机构部分为常开触点继电器和断电脱扣器的电路原理图。 BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a part of the actuator of the present invention is a normally closed relay contacts and the release of FIG. 2 is an electrical actuator portion of the present invention is a normally open relay contact trip and off a circuit diagram. 图3是本发明执行机构部分为可控硅电路原理图。 FIG 3 is a portion of the actuator of the present invention is a circuit diagram of the thyristor. 图4是单片机对处理的电流波形进行判断、检测的流程图。 FIG 4 is a microcontroller for the determination of the current waveform processing flowchart detected. 图5、图6是单片机程序中断的流程图。 5, FIG. 6 is a flowchart of the interrupt program the microcontroller. 具体实施方式实施例l:如图1所示,被保护的电路由AC220V输入端8输入220V交流电压,经故障电弧保护电路的常闭触点继电器9,由AC220V输出端ll输出。 DETAILED DESCRIPTION Embodiments Example l: as shown, the protected circuit from the input terminal AC220V FIG 1 8 220V AC voltage, the normally closed relay contacts arc fault protection circuit 9, the output terminal ll AC220V output. 被保护线路连接该故障电弧保护电路,直流电源VCC为故障电弧保护电路提供电源。 The protection circuit connected to the arc fault protection circuits, DC power supply VCC to provide power to the arc fault protection circuit. 电路正常时,电流耳感器2检测到的波形为连续的负载电流波形;当电路有电弧产生时,由于电流互感器2的特性,使电流互感器2检测到的电流波形有移位。 When the circuit is normal, the current sensor 2 detects the ear waveform continuous load current waveforms; when there arc circuit, since the characteristics of the current transformer 2, and the current waveform of the current transformer 2 detected by the displaced. 电流互感器2检测穿过其的被保护线路中的交流电流信号,然后将检测到的电流波形信号由全波整流桥3整流,并且由电阻Ri4和R35分压后变为直流信号,然后将该直流信号输入到单片机7,单片机7通过比较前后采样电流的AD值,AD值是指模拟信号转为数字信号对应的数值,来判断电流波形是否有移位现象,从而判断是否有故障电弧。 2 through current transformer detecting an alternating current signal which is in the protected circuit, and the detected current waveform signal from the full-wave rectifier bridge rectifier 3, and by the rear dividing resistors R35 and Ri4 into a DC signal, and then the DC signal 7 input to the microcontroller, the microcontroller 7 through the AD value of the sample before and after the current, the AD value is converted to a digital signal corresponding to the analog signal value, to determine whether a shift phenomenon of the current waveform to determine whether an arc fault. 当没有检测到故障电弧时,单片机7发出低电平信号,三极管10是截止的,电源通过常闭触点继电器9为被保护的电器提供工作电压;当检测到被保护电路中有故障电弧产生时,单片机7发出高电平控制信号,使得三极管10导通,此时位于集电极的常闭触点继电器9断开,实现切断电源,达到对电路的保护,避免电气火灾的发生。 When an arc fault is not detected, the microcontroller 7 a low signal, the transistor 10 is turned off, the power supply through a normally closed contact of relay 9 provide the operating voltage of the collector is protected; when detecting a fault in the protected circuit arc when the microcontroller 7 emits high-level control signal, so that the transistor 10 turns on, then the collector is located normally closed contact relay 9 is turning off, cut off the power to protect the circuit, to avoid electrical fires. 当故障电弧排除后,电源通过电阻R26重新对故障保护电路通电复位,单片机重新开始工作。 When the arc fault exclusion, re-energized to reset the power supply fault protection circuit via a resistor R26, the microcontroller to start operating again. 如图4、图5、图6所示,单片机的工作流程如下: (1)单片机进行上电复位,单片机上电后,电源VCC经过电阻R2,至单片机引脚使单片机复位,然后到步骤(2);(2) 单片机程序初始化,此时所有标志位为0,模拟信号转换为数字信号对应的数值AD为ADo, A/D转换信号采样从单片机的一个引脚输入,然后到步骤(3);(3) 单片机判断A/D转换是否完成,当没有新AD值产生时,A/D 转换完成标志为O,并继续判断是否新的AD值产生;当有新的AD值产生时,A/D转换完成标志为1,并记下新的AD值ADi,然后到步骤(4);(4) 单片机清零A/D转换完成标志,并且比较ADi值和ADo值, 不相等则到步骤(5),相等则到步骤(8);(5) 单片机自动更新AD值,用当前AD值ADi替换已有的AD值AD0,然后到步骤(6);(6) 单片机检测电弧标志,当电弧标志为0时,转到步骤(14);当电弧标志为l时,到步骤(7);(7) 单片机发出切 4, 5, 6, the microcontroller workflow is as follows: (1) After power on reset microcontroller, the microcontroller on the power, the power supply VCC through a resistor R2, to the microcontroller pins and reset the device, then step ( 2); (2) SCM program initialization, all flags to 0 at this time, analog signal into a digital signal corresponding to the value of AD is ADo, a / D converter samples a signal from the microcontroller input pins, and then to step (3 ); (3) MCU determining a / D conversion is completed, when no new AD value generating, a / D conversion complete flag is O, and continue to determine whether the new AD value generation; when a new AD value is generated, a / D conversion complete flag is 1, and note the new AD value ADi, and then to step (4); (4) clears the microcontroller a / D conversion complete flag, and the comparison value and ADo ADi value is not equal to step (5), it is equal to step (8); (5) the microcontroller automatically update the AD value, with the current value of AD AD ADi replace the existing value AD0, and then to step (6); (6) the microcontroller detects arc flag, when an arc flag is 0, go to step (14); and when L is an arc flag, to step (7); (7) emitted cut SCM 电源的控制信号;(8) 单片机检测发现电弧标志,当发现电弧标志为0时转到步骤(9),当发现电弧标志为1时转到步骤(10);(9) 保存此刻时间,记为Tl,置位发现电弧标志,即发现电弧标志为l,然后到步骤(10);(10) 单片机检测电弧标志,当电弧标志为O时到步骤(11),当电弧标志为1时转到步骤(13);(11) 第一次时间判断,用当前时间T2减去电流波形移位开始时间Tl,得时间差Tsi,当TS1大于设定值T设i时转到步骤(12), 小于设定值T设i时转到步骤(3);(12) 置位电弧标志,即电弧标志为l,然后到步骤(13);(13) 第二次时间判断,用当前时间T3减去电流波形移位开始时间Tl,得一时间差Ts2,当Ts2大于设定值T设2时转到步骤(14), 小于设定值T设2时转到步骤(3);(14) 将所有的标志清零,并转到步骤(3);单片机是定时采样,当以下两种方式中有一种出现时,单片机中断工作,执行 Signal power control; (8) found that the microcontroller detects arc flag, when the flag is found that the arc proceeds to step 0 (9), when the flag is found that the arc proceeds to step (10) 1; (9) at the moment to save time, remember is Tl, the set found arc flag, i.e. find the arc marked as L, and then to step (10); (10) the microcontroller detects arc flag, when the arc flag is O to step (11), transfer when the arc flag is 1 the step (13); (11) determining the first time, the current time T2 by subtracting a current waveform shift start time Tl, to obtain the time difference of Tsi, when set to a value larger than the set T i when TS1 step (12), than the set value go to step (3) is provided T i; (12) arc set flag, i.e. flag L arc, and then to step (13); (13) determining a second time, with the current time T3 Save current waveform to the shift start time Tl, to obtain a time difference Ts2, when Ts2 is set to be greater than the step (14) when the set T 2 values ​​than the set value go to step (3) is provided T 2; (14) All the flag is cleared, and go to step (3); SCM is the sampling timing, when there is a two ways occurs, the interrupt working, performed 中断程序,然后再继续从中断的地方继续工作。 Interrupt program, and then continue from where it left off to continue working. (1) 定时中断,设置一时间段T,每隔时间T,程序就会自动定时中断,中断后再重新计时;(2) A/D转换完成中断,保存电流值,置位A/D转换完成标志, 即A/D转换完成标志为l。 (1) The timer interrupt, setting a period of time T, at intervals of time T, the program will automatically timer interrupt, the interrupt and then re-timing; (2) A / D conversion complete interrupt, save a current value, the set A / D converter complete flag, i.e. A / D conversion complete flag is l. 实施例2:本实施例与实施例1最大的不同在于:执行机构部分为常开触点继电器。 Example 2: This Example is different from Example 1 in that the maximum: the actuator portion relay normally open contact. 当判断无电弧故障时,单片机7控制输出引脚置为高电平使三极管10导通,位于集电极的常开继电器9吸合,电源通过闭合的继电器给电路供电,保护电路正常运行;当判断出有故障电弧时,单片机7会发出低电平控制信号,使得三极管10截止,此时常开触点继电器9断开,实现切断电源,达到对电路的保护。 When it is judged no arc fault, the microcontroller 7 controls the output pin is high so that transistor 10 is turned on, the collector of the normally open relay located pull 9, the power supply to the circuit by closing the relay, the normal operation of the protection circuit; and when when it is determined that there is an arc fault, the microcontroller 7 will send a low level control signal, so that the transistor 10 is turned off, the relay normally open contact 9 at this time is turning off, cut off the power to protect the circuit. 实施例3:本实施例与实施例1最大的不同在于:执行机构部分为上电脱扣器。 Example 3: Example of the present embodiment is different from Embodiment 1 in that the biggest: the electrical actuator portion of the release. 当判断无电弧故障时,单片机7控制输出引脚置为低电平,三极管10截止,位于三极管集电极的上电脱扣器9闭合,电源通过闭合的脱扣器供电,电路正常运行;当判断出有故障电弧时,单片机7会发出高电平控制信号,使得三极管IO导通,此时上电脱扣器9断开, 实现切断电源,达到对电路的保护。 When it is judged no arc fault, the microcontroller 7 controls the output pin is set low, the transistor 10 is turned off, is located on the power transistor collector release 9 is closed, the power supply is closed through the release, the normal operation of the circuit; and when when it is determined that there is an arc fault, the microcontroller 7 will send high-level control signal, so that the IO transistor turns on, then the power release 9 is turning off, cut off the power to protect the circuit. 实施例4:本实施例与实施例1最大的不同在于:执行机构部分为断电脱扣器。 Example 4: This Example is different from Example 1 in that the maximum: the actuator is de-energized release portion. 当判断无电弧故障时,单片机7控制输出引脚置为高电平使三极管10导通,位于集电极的断电脱扣器9闭合,电源通过闭合的脱扣器给电路供电,保护电路正常运行;当判断出有故障电弧时,单片机会7发出低电平控制信号,使得三极管10截止,此时断电脱扣器9 断开,实现切断电源,达到对电路的保护。 When it is judged no arc fault, the microcontroller 7 controls the output pin is high so that transistor 10 is turned on, a collector positioned release 9 is closed off, a power supply circuit through the closed release, normal protection circuit operation; when it is determined that there is an arc fault, the microcontroller 7 will issue a low level control signal, so that the transistor 10 is turned off, a power failure occurs release 9 is turning off, cut off the power to protect the circuit. 实施例5:本实施例与实施例1最大的不同在于:执行机构部分为可控硅。 Example 5: This Example is different from Example 1 in that the maximum: the actuator portion of the thyristor. 当判断无电弧故障时,单片机7控制输出引脚置为低电平,使得三极管10截止,光耦13和光耦16导通,可控硅9和可控硅17导通,电源通过导通的可控硅给电路供电,电路正常运行;当判断出有故障电弧时,单片机7会发出高电平控制信号,三极管10导通,使得光耦13和光耦16截止,可控硅9和可控硅17断开,实现切断电源,达到对电路的保护。 When it is judged no arc fault, the microcontroller 7 controls the output pin is set low, so that transistor 10 is turned off, optocoupler 13, and optocoupler 16 is turned on, the thyristor 9 and the thyristor 17 is turned on, the power supply is turned on by SCR to the circuitry, the normal operation of the circuit; and when it is determined that there is an arc fault, the microcontroller 7 will send a control signal is high, transistor 10 is turned on, so that the optical coupler 13 and optical coupler 16 is turned off, and a controllable thyristor 9 silicon 17 is turning off, cut off the power to protect the circuit.

Claims (12)

1、故障电弧检测方法,该方法能通过故障电弧保护电路检测到危险电弧,其特征在于包括步骤: 通过信号采样装置(2)实时对电流信号进行采样,并将采样数据提供给信号处理模块; 信号处理模块处理完电流信号,将结果传递给电弧检测控制装置进行检测,电弧检测控制装置为单片机(7),其检测判断是否有故障电弧产生的程序为: (1)单片机进行上电复位,然后到步骤(2); (2)单片机程序初始化,此时所有标志位为0,模拟信号转换为数字信号对应的数值AD为AD0,A/D转换信号采样从单片机的一个引脚输入,然后到步骤(3); (3)单片机判断A/D转换是否完成,当没有新AD值产生时,A/D转换完成标志为0,并继续判断是否新的AD值产生;当有新的AD值产生时,A/D转换完成标志为1,并记下新的AD值AD1,然后到步骤(4); (4)单片机清零A/D转换完成标志,并且比较AD1值和AD 1, an arc fault detection method by arc fault protection circuit detects dangerous arcing, characterized by comprising the steps of: sampling a current signal in real time by the signal sampling means (2), and supplies the sample data to the signal processing module; the signal processing block processed current signal, the results are passed to the arc detection control means detects an arc detection control means for the microcontroller (7), for detecting determines whether a program fault arc is: (1) single-chip power-on reset, then step (2); (2) SCM program initialization, all flags to 0 at this time, analog signal into a digital signal corresponding to the value of AD is AD0, a / D conversion from a sampling signal input pin of the microcontroller, and to step (3); (3) MCU determining a / D conversion is completed, when no new AD value generating, a / D conversion complete flag is 0, and continue to determine whether the new AD value generation; when a new AD generating value, a / D conversion complete flag is 1, and note the new AD value AD1, and then to step (4); (4) clears the microcontroller a / D conversion complete flag, and the AD and the comparison value AD1 0值,不相等到步骤(5),相等则到步骤(8); (5)单片机自动更新AD值,用当前AD值AD1替换已有的AD值AD0,然后到步骤(6); (6)单片机检测电弧标志,当电弧标志为0时,转到步骤(14);当电弧标志为1时,到步骤(7); (7)单片机发出切断电源的控制信号; (8)单片机检测发现电弧标志,当发现电弧标志为0时转到步骤(9),当发现电弧标志为1时转到步骤(10); (9)保存此刻时间,记为T1,置位发现电弧标志,即发现电弧标志为1,然后到步骤(10); (10)单片机检测电弧标志,当电弧标志为0时到步骤(11),当电弧标志为1时转到步骤(13); (11)第一次时间判断,用当前时间T2减去电流波形移位开始时间T1,得时间差TS1,当TS1大于设定值T设1时转到步骤(12),小于设定值T设1时转到步骤(3); (12)置位电弧标志,即电弧标志为1,然后到步骤(13); (13)第二次时间判断,用当前时间T3减去电 0 value not equal to the step (5), are equal to step (8); (5) An Automatic updating the AD value, the AD value AD0 to replace the existing value with the current AD AD1, and then to step (6); (6 ) microcontroller detects arc flag, flag when the arc is 0, go to step (14); when the arc is a flag, to step (7); (7) emits a control signal SCM power-off; (8) the microcontroller detects found arc flag, when the flag is found that the arc proceeds to step (9) is 0, the arc when the flag is found to step (10) 1; (9) at the moment to save time, referred to is T1, the arc found flag is set, i.e., found arc flag is 1, then to step (10); (10) the microcontroller detects arc flag, flag is 0 when the arc to step (11), when the arc flag goes to step (13) 1; (11) a first time determination times, with the current time T2 by subtracting a current waveform shift start time T1, the time difference obtained TS1, TS1 when greater than the set time T set to 1, step (12) value, than the set value T set to 1 when the step of (3); (12) arc flag is set, i.e., the arc flag is 1, then to step (13); (13) a second time determination, by subtracting the current time T3 波形移位开始时间T1,得一时间差TS2,当TS2大于设定值T设2时转到步骤(14),小于设定值T设2时转到步骤(3); (14)将所有的标志清零,并转到步骤(3); 当单片机(7)检测到电弧时,产生电弧标志。 Waveform shift start time T1, the time to give a difference TS2, TS2 is greater than when the step is set to (14) set when T 2 value, than the set value go to step (3) is provided T 2; (14) all flag is cleared, and go to step (3); when the microcontroller (7) detects an arc, an arc is generated flag.
2、 根据权利要求1所述的故障电弧检测方法,其特征在于:信号釆样装置(2)采样的信号为电流波形。 2. The arc-fault detection method according to claim 1, wherein: the signal means preclude the sample (2) is the sampled current waveform signal.
3、 根据权利要求1所述的故障电弧检测方法,其特征在于:信号处理模块对电流波形进行处理。 3, an arc fault detection method according to claim 1, wherein: the signal processing module for processing the current waveform.
4、根据权利要求1所述的故障电弧检测方法,其特征在于:电弧检测控制装置(7)对处理的电流波形进行判断、检测。 4. The arc fault detection method according to claim 1, wherein: the arc detection control means (7) for determining the current waveform processing is performed, is detected.
5、 根据权利要求1所述的故障电弧检测方法,其特征在于:单片机(7)检测、判断电流波形的程序包括中断程序:设置一时间段T,每隔时间T,程序就会自动定时中断,中断后重新计时。 5. The arc fault detection method according to claim 1, wherein: the microcontroller (7) is detected, the program determines the current waveform interrupt program comprises: setting a period T, at intervals of time T, the timer interrupt program will automatically , re-timing after an interruption.
6、 根据权利要求1所述的故障电弧检测方法,其特征在于:单片机(7)检测、判断电流波形的程序包括中断程序:A/D转换完成中断,单片机保存电流值,置位A/D转换完成标志。 6. The arc fault detection method according to claim 1, wherein: the microcontroller (7) is detected, the program determines the current waveform interrupt program comprising: A / D conversion complete interrupt, save a current value of the microcontroller, the set A / D conversion complete flag.
7、 故障电弧保护电路,包括电源部分,其特征在于:所述的故障电弧保护电路还包括信号采样装置(2)、信号处理模块、电弧检测控制装置(7)和切断电源模块,所述的信号釆样装置(2)为带铁芯的电流互感器;所述的信号处理模块依次连接了全波二极管整流桥(3)、分压电阻Ri (4)和R3 (5);所述的电弧检测控制装置(7) 为单片机;所述的切断电源模块依次连接了三极管(10)和执行机构部分(9)。 7, arc fault protection circuit comprising a power supply portion, wherein: said arc fault protection circuit further comprises signal sampling means (2), the signal processing module, the arc detection control means (7) and cut off the power module, the Bian signal sampling device (2) as a current transformer with cores; said signal processing module in turn is connected to a full-wave diode rectifier bridge (3), the voltage dividing resistor Ri (4) and R3 (5); the arc detection control means (7) for the microcontroller; cutting the power supply module is connected to turn the transistor (10) and actuator portion (9).
8、 根据权利要求7所述的故障电弧保护电路,其特征在于:所述的执行机构部分(9)为常闭触点继电器。 8, an arc fault protection circuit as claimed in claim 7, wherein: said actuator portion (9) is a normally closed relay contact.
9、 根据权利要求7所述的故障电弧保护电路,其特征在于:所述的执行机构部分(9)为常开触点继电器。 9. The arc fault protection circuit as claimed in claim 7, wherein: the actuator portion (9) of the normally open contact of the relay.
10、 根据权利要求7所述的故障电弧保护电路,其特征在于:所述的执行机构部分(9)为上电脱扣器。 10. The arc fault protection circuit as claimed in claim 7, wherein: said actuator portion (9) for the power release.
11、 根据权利要求7所述的故障电弧保护电路,其特征在于:所述的执行机构部分(9)为断电脱扣器。 11. The arc fault protection circuit as claimed in claim 7, wherein: said actuator portion (9) is de-energized releases.
12、根据权利要求7所述的故障电弧保护电路,其特征在于:所述的执行机构部分(9)为可控硅。 12. The arc fault protection circuit as claimed in claim 7, wherein: said actuator portion (9) is a thyristor.
CN 200510033926 2005-03-31 2005-03-31 Fault arc detection method and protection circuit thereof CN100432683C (en)

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CN101154800B (en) 2007-09-29 2010-11-17 吴为麟 Device for detecting trouble electric arc
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